To the same pot, add remaining 1 cup oil and flour. Cook for 20 to 25 minutes, stirring constantly, to make a dark brown roux. Add onion and bell pepper. Cook, stirring occasionally, for approximately 5 minutes, or until soft. Add stock. Bring to a boil, and then reduce heat to medium-low. Add duck pieces and 1-1/2 teaspoons salt and 1/2 teaspoon cayenne pepper. Cook, uncovered, stirring occasionally, for approximately 1-1/2 hours.

Add sausage and simmer for 30 minutes. Skim off any fat that rises to the surface. Add oysters and liquid and simmer for 2 to 3 minutes, or until edges or oysters curl. Remove from heat. Adjust seasonings to taste. Add parsley and serve immediately with steamed rice.

Notes

*If andouille sausage is not available, you may substitute fresh pork sausage.